Electrode for electric furnaces and process of making the same.



UNITED STATES PATENT OFFICE.

EDGAR F. PRICE AND FRANK J. TONE, QF NIAGARA FALLS, NEW'2YORK.

ELECTRODE non ELECTRIC mmiucas Ann rixocassor iimxnve 'rnn sum.

Specification of Letters Patent. I

Patented my 12, 1908.

Application filed 8, 1906 Serial No. 296,098. Renewed December 26, 1907. Serial No. 408,150.

To all whom it may concern:

Be it known that we, EDGAR F. PRICE and FRANK J. TONE, citizens of the United States,

residing at Niagara Falls, in the county of Niagara and State of New York, have invented certain new and useful Improve ments in Electrodes for Electric Furnaces and Process of Making the Same, of which the following is a specification.

The electrodes usuall employed in electric furnaces consist eit er ofa mixture of amorphous carbon and abinder, or of raphitized carbon' oduced, for examplefby the rocess of G. 'Ache'son.

Amorphous carbon'electrodes are hard,

binder, specifically one containing graphite i graphitized carbonproduced by any usual and amorphous carbon in such proportions as to. give the desired electrical and heat c'onconsists in sha ing a mixture of electricallyproduced grap ite and a hydrocarbon binder into an electrode, and heating it to a-temductivity. h t

In manufacturing the new' electrode,

electric furnace method is pulverized or ground and mixed with-a suitable hydrocarbon capable of'being converted into a ermanent binder. The mixture is then mol and baked at atemperature sufficient to de p Into an electrode, and heatingfit in a nonoxicompose the hydro-carbon, and drive off the volatile constituents, leaving residual carbon which serves as a binder for the graphite.

For certain purposes, it has been found de sirable to employ electrodes having alowe'r' 3 cases it is advantageous to replace a portion 'of 'the graphite by ordinary amorphous car-- 50 bon. The electrical and heat conductivities,

'of the'product are then a function of the ratio between the amounts of contained graphite and amorphous carbon "and may therefore be fixed at any predetermined figure.

The electrodes made bythe herein describedprocess are of uniform composition, through Patent Number 702,758, to

dedv

' produced grap trically graphitized after being molded'as the large ercentage of breakage incident to the manu acture of the latter is obviated; and

utilized- The low mechanical strength of ,electrodes which are electrically graphitized after being molded has been found to be a serious disadvantage in electric furnace ractice, especially when employmg electro es of moreover theelectric heat is more efficiently large size or extreme length. The use of electrodes made by the herein described process has been found to offer considerable advantage on account of'their superior mechanical strength.

We claimi Y p 1.. An electrode for electric furnaces, com prisin a mixture of electrically-produced graphite and a binder, as set forth.

2. An electrode. for electric furnaces, consisting of a mixture of electrically-produced erature suflicientt'o coke the binder, as set orth. ,j 5. The process of making electrodes, which roduced grap lite and a hydrocarbon binder dizin atmosphere to a temperature sufficient to'co e the binder, as set forth.

6. The'process of making electrodes, which consists in shaping a mixture of electricallymto an electrode, and electrically heating it to a temperature sufficient to coke the binder,

as set forth.

' 7. The process of making electrodes, which consists in sha ing a mixture of electricallyproduced. grap ite and a hydrocarbon binder consists in sha ing a-Inixture of electrically 'te and a hydrocarbon binder into an electrode, and electricallyheating it in a nonoxidizing atmosphere to a temperature sufficient to coke the binder,-as set forth. l 1 1 I) 8. The process of making electrodes, which .consists in shaping a mixture of electrically -produced grap te, amorphous carbon and a heatingit to a temperature sufiicient to coke the binder, as set forth.

9. The process of making electrodes, which consists in sha ing a mixture of electricallyproduced grapii hydrocarbon binder into an electrode, and heating it in a nonoxidizing atmosphere to a temperature sufiicient to coke the binder, as set forth.

10. The process of making electrodes, which consists in shaping a mixture of electrically-produced graphite, amorphous carbon and a hydrocarbon binder into an electrode, and electrically heating it to a temperature sufficient to coke the binder, as set forth 11. The process of making electrodes,

ite, amorphous carbon and a which consistsin shaping a mixture of electrically-produced graplnte, amorphous car- 20 bon and a hydrocarbon binder into an electrode, and electrically heating it in a nonoxidizing atmosphere to a temperature suflicient to coke the binder, as set forth.

In testimony whereof, we aflix our signatures in presence of two Witnesses.

EDGAR F. PRICE. FRANK J. TONE. Witnesses as to the signature of Edgar F. Price:

J. S. JACKSON, F. B. OCoNNoR. Witnesses as to the signature of Frank J Tone:

ASHMEAD G. RODGERS, FRANK L. BUELL. 

